Creating a CNAME record for each of the domain addresses or subdomains that you've got within a hosting account will enable you to direct it to a different domain/subdomain. The forwarded domain will lose all of its records - A, MX and so on, and will take the records of the Internet domain it is being forwarded to. In this light, you cannot set up a CNAME record to forward your domain to a third-party provider and retain a working email service with the first hosting provider. It is also essential to know that a CNAME record is always a string of words and never a number because it is commonly confused with the A record of the domain name being forwarded. One of the major uses of a CNAME record is to forward a domain name you own through one provider to the servers of another company if you have set up an Internet site with the latter. This way, the website will appear under your own domain name, not under some subdomain provided by the third-party provider.